Accessory attachment for sound recording apparatus



L. NEUMANN June 6, 1939.

ACCESSORY ATTACHMENT FOR SOUND RECORDING APPARATUS Filed Feb. 24, 1957 2 Sheets-Sheet 1 L. NEUMANN June 6, 19 39.

ACCESSORY ATTACHMENT FOR SOUND RECORDING APPARATUS Filed Feb. 24, 19-37 2 Sheets-Sheet 2 Fig. .5

Fig. 4-

Patented June 6, 1939 UNITED STATES ACCESSORY ATTACHMENT FOR. SOUND RE- CORDING APPARATUS Leopold Neumann, Vienna, Austria, assignor to the firm Ronag A. G., Chur, Switzerland, a company of Switzerland Application February 24, 1937, Serial No. 127,546 In Austria February 1, 1937 2 Claims.

This invention relates to an accessory attachment for apparatus for recording acoustic oscillations, consisting of an electrically excited diaphragm which closes over one end of a soundconducting tube into the other end of which there is fitted a recording soundbox, and consists in fitting the electrically excited diaphragm into one end of a sound-conducting tube the other, open, end of which is adapted to be fitted to the acoustic sound-box. By means of an accessory device or attachmentof this nature it becomes possible to convert any talking machine that is suitable for recording by a purely acoustic method, into a recording apparatus of the microphone type, in a simple manner by the mere fitting of the attachment to the acoustic soundbox.

Two forms of construction embodying the invention are shown, by way of example, in the accompanying drawings, in which:

Fig. 1 shows an arrangement or installation according to the invention, partly in section, and partly diagrammatically, in connection with a cylindrical-record talking machine.

Figs. 2 and 3 show, in side elevation and in plan view respectively, an attachment according to the invention, as used in connection with a disc-record talking machine.

Fig. 4 shows in front elevation and Fig. 5 in side elevation means for suspending the microphone from the neck of the user.

Referring to Fig. 1, the acoustic recording sound-box 2 rests with its needle upon the record cylinder l and is moved transversely thereof by means of the screw spindle 3. The recording sound-box is provided with a short tubular connection 4 to which, in the case of the usual types of apparatus working purely acoustically, there is connected a speaking tube 16 with a funnelshaped mouth-piece IT on its outer end. For the purposeof effecting recording with the aid of a microphone and an electrically excited diaphragm emitting sound waves to operate an acoustic recording sound-box it is merely necessary, in accordance with the invention, to fit to the tubular connection 4 on the sound-box instead of the speaking tube I6 the open end 20 In the form of construction shown in Figs. 2 and 3 a disc-shaped record or sound groove carrier II is used for making a sound record with the aid of the attachment according to the invention. Recording is effected in this case by means of the acoustic sound-box l2 mounted on a tone arm I3 which may be selectively fitted into the orifice I4 of the reproducing horn 19 or into the orifice 23 of the sound-conducting tube 24 leading to the tubular connection 15. During recording the tone arm 13 is guided over the record disc by means of a slotted link 22 operated by the driving mechanism of the apparatus. To the tubular connection l5 there is fitted, in the same manner as with the cylinder record talking machine already described, the open narrow end 20 of the sound-conducting tube 5 into the expanded or widened end of which there is fitted the electrically driven diaphragm.

The microphone is generally hung round the neck of the person using the apparatus, by means of a hoop member 2| (Figs. 4 and 5). The microphone transformer 8 and the battery H] are preferably either combined with the microphone to form a structural unit (see Figs. 4 and 5) or housed in the casing l for the electrically excited diaphragm, so that the complete attachment according to the invention consists merely of two parts connected together by a flexible cable which may be of any desired length.

The attachment according to the invention is suitable for use in connection with sound recording systems of all kinds, and is independent of the relative size of the electrically operated and acoustically excited diaphragms.

I claim:

1. In a device for recording sound, a tubular member, a sound box carried by said member at one of its ends, the other end of said member having a socket, a sound conducting chamber having a neck to fit into the socket of said tubular member and be removably held therein, a diaphragm in said chamber, and an electromagnetic diaphragm-operating device mounted in said chamber, said chamber diaphragm and said diaphragm-operating device comprising a unitary structure.

2. An attachment for sound recording machines which have a sound box with a tubular arm whose free end is provided with a socket to receive a sound conductor; a sound generator comprising a box-like chamber closed save for a neck which is constructed to fit detachably the free end of said arm, a diaphragm mounted in said chamber, and an electro-mag netic diaphragm-operating device also mounted in said chamber to cooperate with said diaphragm.

LEOPOLD NEUMANN. 

